Plumb timeToNextEffect through players and animation

Source/core/animation/Animation.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 73 matching lines @@
 
 void Animation::updateChildrenAndEffects(bool wasInEffect) const
 {
     ASSERT(m_activeInAnimationStack == wasInEffect);
     if (isInEffect())
         const_cast<Animation*>(this)->applyEffects(wasInEffect);
     else if (wasInEffect)
         const_cast<Animation*>(this)->clearEffects();
 }
 
+double Animation::calculateTimeToEffectChange(double inheritedTime, double activeTime, Phase phase) const
+{
+    if (phase == PhaseBefore) {
+        return activeTime - inheritedTime;
+    }
+    if (phase == PhaseActive) {
+        return 0;
+    }
+    if (phase == PhaseAfter) {
+        // If this Animation is still in effect then it will need to update
+        // when its parent goes out of effect. We have no way of knowing when
+        // that will be, however, so the parent will need to supply it.
+        return -1;
+    }
+    ASSERT_NOT_REACHED();
+    return 0;
+}
+
 } // namespace WebCore